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#include <QtGui>

#include "zflowlayout.h"

ZFlowLayout::ZFlowLayout(QWidget *parent, int margin, int spacing)
: QLayout(parent)
{
	setMargin(margin);
	setSpacing(spacing);
}

ZFlowLayout::ZFlowLayout(int spacing)
{
	setSpacing(spacing);
}

ZFlowLayout::~ZFlowLayout()
{
	QLayoutItem *item;
	while ((item = takeAt(0)))
	delete item;
}

void ZFlowLayout::addItem(QLayoutItem *item)
{
	itemList.append(item);
}

int ZFlowLayout::count() const
{
	return itemList.size();
}

QLayoutItem *ZFlowLayout::itemAt(int index) const
{
	return itemList.value(index);
}

QLayoutItem *ZFlowLayout::takeAt(int index)
{
	if (index >= 0 && index < itemList.size())
		return itemList.takeAt(index);
	else
		return 0;
}

Qt::Orientations ZFlowLayout::expandingDirections() const
{
	return 0;
}

bool ZFlowLayout::hasHeightForWidth() const
{
	return true;
}

int ZFlowLayout::heightForWidth(int width) const
{
	int height = doLayout(QRect(0, 0, width, 0), true);
	return height;
}

void ZFlowLayout::setGeometry(const QRect &rect)
{
	QLayout::setGeometry(rect);
	doLayout(rect, false);
}

QSize ZFlowLayout::sizeHint() const
{
	return minimumSize();
}

QSize ZFlowLayout::minimumSize() const
{
	QSize size;
	QLayoutItem *item;
	foreach (item, itemList)
		size = size.expandedTo(item->minimumSize());

	size += QSize(2*margin(), 2*margin());
	return size;
}

int ZFlowLayout::doLayout(const QRect &rect, bool testOnly) const
{
	 int x = rect.x();
	 int y = rect.y();
	 int lineHeight = 0;

	 QLayoutItem *item;
	 foreach (item, itemList) {
		 int nextX = x + item->sizeHint().width() + spacing();
		 if (nextX - spacing() > rect.right() && lineHeight > 0) {
			 x = rect.x();
			 y = y + lineHeight + spacing();
			 nextX = x + item->sizeHint().width() + spacing();
			 lineHeight = 0;
		 }

		 if (!testOnly)
			 item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));

		 x = nextX;
		 lineHeight = qMax(lineHeight, item->sizeHint().height());
	 }
	 return y + lineHeight - rect.y();
}